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    <title>Document</title>
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<body>
    
</body>
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<script>
    function bouncer(arr){
        var brr=[]
        for(i=0;i<arr.length;i++){
            if(arr[i]){
                brr.push(arr[i])
            }
        }
        return brr;

    }
    var crr= bouncer([1,'',null,'蔡徐坤'])
    document.write(crr)
</script>